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authorLuis R. Rodriguez <mcgrof@suse.com>2015-05-27 11:09:38 +0930
committerRusty Russell <rusty@rustcorp.com.au>2015-05-28 11:32:11 +0930
commitd19f05d8a8fa221e5d5f4eaca0f3ca5874c990d3 (patch)
treeaf7ed11bef82faa0e7a33b6ec8739a32ec50f00f /kernel/params.c
parent05f408dddb013168759cdb4cbd0ba4e189a9504d (diff)
downloadlinux-sh-d19f05d8a8fa221e5d5f4eaca0f3ca5874c990d3.tar.gz
kernel/params.c: generalize bool_enable_only
This takes out the bool_enable_only implementation from the module loading code and generalizes it so that others can make use of it. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: linux-kernel@vger.kernel.org Cc: cocci@systeme.lip6.fr Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel/params.c')
-rw-r--r--kernel/params.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/params.c b/kernel/params.c
index b7635c025e9b..324624ed620f 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -335,6 +335,36 @@ const struct kernel_param_ops param_ops_bool = {
};
EXPORT_SYMBOL(param_ops_bool);
+int param_set_bool_enable_only(const char *val, const struct kernel_param *kp)
+{
+ int err = 0;
+ bool new_value;
+ bool orig_value = *(bool *)kp->arg;
+ struct kernel_param dummy_kp = *kp;
+
+ dummy_kp.arg = &new_value;
+
+ err = param_set_bool(val, &dummy_kp);
+ if (err)
+ return err;
+
+ /* Don't let them unset it once it's set! */
+ if (!new_value && orig_value)
+ return -EROFS;
+
+ if (new_value)
+ err = param_set_bool(val, kp);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(param_set_bool_enable_only);
+
+const struct kernel_param_ops param_ops_bool_enable_only = {
+ .flags = KERNEL_PARAM_OPS_FL_NOARG,
+ .set = param_set_bool_enable_only,
+ .get = param_get_bool,
+};
+
/* This one must be bool. */
int param_set_invbool(const char *val, const struct kernel_param *kp)
{